Detecting programmatically whether an app is installed on iPhone

Question

I am in this situation where I have to display a button which says \"Open myApp\" (if myApp is installed on the device) or it says \"Download myApp\" (if myApp is not instal

Answer 1

If the URL scheme for your app is "myapp:", then

BOOL myAppInstalled = [[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"myapp:"]];

(Requires iOS 3.0.)